Electric control system.



No. 868,929.' PATENTED ooTx 22. 1907.

R; P. JACKSON.

LEGTRIG CONTROL SYSTEM.

APPLICATION FILED APR. 3, 1905.

WITNESSES: mv NTOR fix? QJUMW ATTORNEY UNITED STATES PATENT OFFICE.

RA Y P. .LKJKSKDLXH WILKINSB UBO, PllN-YSYLVANIA,iASSlGhOR TO WESTINGHOUSE ELEC- A CUl'tPOllAllON OF PENNSYLVANIA.

ELECTRIC CONTROL SYSTEM.

Specification of Letters Patent.

Patented Oct. 22, 1907;

plicition filed April 3,1905. Serial No; 253,639.

'1'0 all whom it mgy concern.-

Be it known that I, RAY P. JACKSON, a'citizcn of the United Statics, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have 5 invented a new and useful Improvement in Electric Control Systems, oi which the. following is a specification.

My invention relates to control systems for electric motors, and particularly to such systems as embody reversing switch es and circuithreztkers.

The object of my invention is to pro, do it novel and ini n'oved 1n earns for retaining the reversing switch in clo d circuit position, after it has been moved to that until after the circuit-lnenkcr opened. invention comprises a. combination of devices and circuits which. prevents the interruption of the motor circuits by the reversing switch and insures such interruption by the cirr.-.uitl)rca.kcr,-- the contact terminals of which are generally much bcltcr adapted to withstand the destructive effects of arcing than are those of the reversing switch.

I s in a novel combination and cohort-(ions and in ockln" switches 1e Lo-(l by it reversing s -.h and a circuit- :or whicli enables the operating umgnet windings ve us retaining means when the reversing switch has been moved to its closed circuit positions and permits of the omission of retaining magnet windings The single figure of the accompanying drawing illuslrntcs a system embodying my invention.

Alternating current electrical energy is supplied from a trolley conductor 1 and a truck mil 2, through the prinnuy wind lug 3 ol :1 series transformer 4, u circuitbreakcr 5, a nmiu transformer 6, a voltage regulator 7 and a reversing switch 8, to motors 9,

The reversing switch is normally maintained in open circuit position bymcuns of springs l and is moved to its forward and reverse closed circuit positions, respectively, by means of operating nmgnct windings ll null 12, which are supplied with (-nergy from any suitable source, such, for example, as a battery 13, and the c'u" Quits of which are controlled by uuuzlns of u master switch 14.

The secondary winding l5 of llrc series lrunsiormer l is connected in series with the opcruling nuignct winding 16 of an overload relay switch l7 that is conm-cted in circuit with the operating magnet winding [8 of the (ilqllllklfl'lfzllill'5 and inlcrrupls the supply of energy thereto when the current delivered to the motors cxcccds a predetermined amount. The relay switch 17 is also provided Will] a retaining magnet winding 19 i and a core .20 and is moved into the lleld of the windlug 19 when the relay switch is opened, those .lncane serving to prevent the relay switch from being again l l l l l l l l l l l i l l l closed until the master switch has been returned to its 56 off position. i

Mounted upon the reversing switch 8 and operated thereby, is an interlocking switch 21 that serves primarily to prevent energizing oi the operating magnet winding 18 of the circuit-breaker 5 until after the re- 60 versing switch 8 has been moved to one of its closed circuit positions, and it also serves to complete circuits l through the one or the other of the operating magnet windings oi the reversing switch independently of the mast-er switch 14. Interlocking switches 22 and 23, that are opemted by the circuit-breaker 5 and are closed only when the circuit-breaker is closed, are the final means l'or controlling the circuits of the operating magnet windings l 1 and 12 and for preventing the reversing switch from returning to its off position from one of its closed circuit positions until after the circuit-breaker 5 is opened. d

When the master switch is moved to the left, a battery circuit is established through finger 24, drum segment 25 and finger 26M the master switch 14, and 0pcrating magnet winding ll. The reversing switch 8 is then moved to the left and a battery Eircuit is estal lished through contact linger 2i, drum segment 25, contact fingers 2U and 27, conducting segment 28, contact linger 29, relay switch 17, circuithrcztker operating winding 18, contact finger 30, conducting segment 31 and contact finger 32.

The circuit-breaker 5 and interlocking switches 22 and 23 now close and a battery circuit independent of that before established through the master switch 14 is now established through interlocking switch 23, finger 29, conducting segment 28, linger 27 magnet winding ll and interlocking switch 22.

If the master switch 14 is returned to its oil position, the circuit of the operating magnet winding 18 of the circuit-brcztkcr 5 is interrupted and the circuitbreaker opens, but the circuit of the operating magnet winding ll is not opened when the master switch is returned to its off position until after the circuithreukcr is opened.

It more than a. predetermined amount of rl'zrent traverses the series tmnsl'ormcr l, the relay S ll-oh 17 is opened and the cin'uiloi the opemting magnet winding l8 is interrupted, thereby allowing the circuithrenkcr 5 to open. When the core 20 is brought into 100 the held of the magnet winding [9, it is retained in that position until the circuit of the winding 10 is inter distribution, it is of course understood that it may be embodied in systems for the control of motors that are operated by means of direct current. 1

Certain other of the details of construction and ar rangement may be modified, within limits, without departing item the invention. i

I claim as my invention:

1. The combination with a source of energy. a translating device, a circuit-breaker to connect the translating device to said source, a reversing switch and operating magnet windings therefor, of means for causing the said windings to retain the reversing switch in closed circuit position until the circuit-breaker has opened.

2. The combination with a source of energy, a trans 4. The combination with a translating device, a circuit-' breaker, a reversing switch and operating magnets therefor, of an interlocking switch opernted'by the reversing switch to insure retention of the reversing switch in closed position until after the circuit-breaker opens. V

5. The combination'with a translating device, a circuitbrealier, a reversing switch and operating magnets therefor, of two interlocking switches that are respectively operated by the reversing switch and by the circuit-breaker to insure retention of the reversing switch in its closed.

position until after the circuit-breaker opens.

6. The combination with a translating device, a circuitbreaker, is reversing switch and operating magnets therefor, of two interlocking switches one of which is opened and closed directly by the circuitbreakeii and the other of which is opened and -closed directly by the reversing switch. 7

7. The combination with a source of'energy, a translating device, a circuit-breaker to connect the translating for supplying variable voltage energy thereto, ofa circuitbreaker, a reversing switch provided with operating mugnets, on auxiiiary source of energy and two interlocking switches that are respectively operated by the circuitbreaker and the reversing switch.

9. The combination with a translating device and means for supplying variable voltage energy thereto, of a circuitbreakcr, a reversing switch provided with operating magnets, a master switch for making and breaking the circuit of either of said magnets, and interlocking switches for maintaining the circuit of the energized magnet until after the circuit-breaker opens.

I 10. The combination with a translating device and means for supplying energy thereto, of a circuit-breaker, :1 reversing switch provided with opera'ting magnets, amaster switch for closing the circuit of either of said magnets and opening that of the other, and means for maintaining the circuit of the energized magnet until after the circuitbreaker opens.

11. The combination with a source of energy, a translating device, a circuitbreaker to connect the translating device to'snid source, a reversing switch, and operating means therefor, of means for preventing movement of the reversing switch to open-circiiit position until after the circuit-breaker opens.

12. The combination with a translating device, of a circuit-breaker to connect the translating device to said source, a reversing switch means for operating said reversing switch, and means for preventing movement of the reversing switch to open-circuit position until after the circuitbreaker opens.

In testimony whereof, I have hereunto subscribed my name this 31st day of March, 1905.

' RAY I. JACKSON.

Witnesses F. E. \VYNNH, Binxnr IIINES. 

